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Akkermansia muciniphila Reduces Peritonitis and Improves Intestinal Tissue Wound Healing after a Colonic Transmural Defect by a MyD88-Dependent Mechanism
Metabolism and Nutrition Research Group, Louvain Drug Research Institute, Walloon Excellence in Life Sciences and BIOtechnology (WELBIO), UCLouvain, Université Catholique de Louvain, Brussels, Belgium; Colorectal Surgery Unit, Cliniques Universitaires Saint-Luc, Brussels, Belgium.
Metabolism and Nutrition Research Group, Louvain Drug Research Institute, Walloon Excellence in Life Sciences and BIOtechnology (WELBIO), UCLouvain, Université Catholique de Louvain, Brussels, Belgium.
Pathology Department, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium.
Colorectal Surgery Unit, Cliniques Universitaires Saint-Luc, Brussels, Belgium.
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2022 (English)In: Cells, E-ISSN 2073-4409, Vol. 11, no 17, article id 2666Article in journal (Refereed) Published
Abstract [en]

Anastomotic leakage is a major complication following colorectal surgery leading to peritonitis, complications, and mortality. Akkermansia muciniphila has shown beneficial effects on the gut barrier function. Whether A. muciniphila reduces peritonitis and mortality during colonic leakage is unknown. Whether A. muciniphila can directly modulate the expression of genes in the colonic mucosa in humans has never been studied. We investigated the effects of a pretreatment (14 days) with live A. muciniphila prior to surgical colonic perforation on peritonitis, mortality, and wound healing. We used mice with an inducible intestinal-epithelial-cell-specific deletion of MyD88 (IEC-MyD88 KO) to investigate the role of the innate immune system in this context. In a proof-of-concept pilot study, healthy humans were exposed to A. muciniphila for 2 h and colonic biopsies taken before and after colonic instillation for transcriptomic analysis. Seven days after colonic perforation, A.-muciniphila-treated mice had significantly lower mortality and severity of peritonitis. This effect was associated with significant improvements of wound histological healing scores, higher production of IL22, but no changes in the mucus layer thickness or genes involved in cell renewal, proliferation, or differentiation. All these effects were abolished in IEC-MyD88 KO mice. Finally, human subjects exposed to A. muciniphila exhibited an increased level of the bacterium at the mucus level 2 h after instillation and significant changes in the expression of different genes involved in the regulation of cell cycling, gene transcription, immunity, and inflammation in their colonic mucosa. A. muciniphila improves wound healing during transmural colonic wall defect through mechanisms possibly involving IL22 signaling and requiring MyD88 in the intestinal cells. In healthy humans, colonic administration of A. muciniphila is well tolerated and changes the expression of genes involved in the immune pathways.

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 11, no 17, article id 2666
Keywords [en]
Akkermansia muciniphila, Myd88, colonic leakage, peritonitis, wound healing
National Category
Immunology
Identifiers
URN: urn:nbn:se:oru:diva-101170DOI: 10.3390/cells11172666ISI: 000851017500001PubMedID: 36078075Scopus ID: 2-s2.0-85137845423OAI: oai:DiVA.org:oru-101170DiVA, id: diva2:1694825
Note

Funding agencies:

Fonds de la Recherche Scientifique - FNRS FNRS T.0030.21 J.0027.22 WELBIO-CR-2022A-02 WELBIO-CR-2019C-02R 30770923 40007505  

Netherlands Organization for Scientific Research (NWO) 024.002.002

Available from: 2022-09-12 Created: 2022-09-12 Last updated: 2023-12-08Bibliographically approved

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Repsilber, DirkRangel, IgnacioBrummer, Robert Jan

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